Pulverizing and granulating mill



Nov. 20, 1934.v P, w. KENNEDY i PULVERIZING AND GRANULATING MILL Filed Nov. 5, 1932 F w 0h Pm W y w W m f k ah( n u M f L W a 7 4 w, ha

Patented Nov. 20, 1934 SATES PATENT csic 2 Claims.

This invention relates to pulverizing mills and more particularly to a mill for pulverizing of fertilizers or the like.

An object of this invention is to provide a 5 puiverizing means for granulating 'fertilizers of various kinds, particularly where the fertilizers have initially been granulated and left standing for a period of time, during which time the fertilizer becomes hardened into relatively hard lumps which can only be broken up by running through a grinding mill.

Another object of this invention is to provide a grinding mill of this kind which is so constructed that it is readily portable and can be operated to provide any desired quantity of pulverized material.

A further object of this invention is to provide in a mill of this type a screen disposed below the grinding drum which prevents the passage of unbroken lumps while permitting the free passage of material which has been pulverized to the desired degree.

A still iurthei1 object of this invention is to provide a mill of this kind so constructed that it is not necessary to use a screen, thereby permitting the faster grinding or pulverization of the material which, after passing the grinding teeth, will be ground up to the desired degree.

Still another object of this invention is to provide a grinding mill which is constructed to operate at a relatively high speed and which embodies features whereby the grinding' and screening of the material can be effected in one operation, thereby reducing the cost of handling the material, and permitting the construction of device which is readily portable.

The above and various other objects and advantages or" this invention will in part be described and in part be understood from the folloa/ing detailed description of the present preferred embodiment, the same being illustrated 1n the accompanying drawing wherein there is disclosed a vertical section partly in detail taken substantially through the center of a device constructed according to the preferred embodiment of this invention.

Referring to the drawing wherein like numerals of reference designate corresponding' parts, the numeral 10 designates generally a hopper constructed of side walls 11, a front wall 12 and a rear wall 13, The side walls 11 are constructed cf relatively light material such as sheet metal or the like.

rEhe front wall 12 has an upper L-shaperl strap or bracket 14 provided with an elongated slot l5 through which a bolt 16 passes, and this bolt also passes through the apertured end of the strap 11i. Through the provision of an elongated slot 15, the upper end of the front Wall (c1. ss-u) 12 can be adjusted to any desired angle within the limit of the slot 15.

A lower L.shaped bracket 17 is secured to the front wall 12 adjacent the lower edge thereof, and this bracket 17 is provided with an elongated slot 18 through which a bolt 19 passes so that the lower end of the front wall l2 may be adjusted relative to the vertical and to the parts hereinafter described.

The rear wall 13 is provided with a bracket 20 having an elongated slot 21 through which a bolt 22 is disposed to adjustably mount the upper end of the rear wall 13 relative to the adjacent edgeof the side wall 11. This bolt 22 also passes through the opposite end of the side strap 14. A lower bracket or adjusting member 23, of a construction similar to the bracket 20, is secured to the rear wall 13 adjacent the lower end thereof, and this bracket is provided with an elongated slot 24 through which an adjusting bolt 25 passes. This bolt also passes through the adjacent end of the lower side strap 14.

The hopper 10 is supported on a frame structure F of desired construction, and this frame structure also includes a platform P mounted on the top of the frame forwardly of the hopper 10 so that the workman may readily stand in front of the hopper 10 to place the material into this hopper. v l

In order to provide a means for pulverizing or granulating material, such as fertilizer or the like, I have provided a grinding drum, generally designated as 26, which is secured to a shaft 27 journaled in bearings 28 carried by the frame F.

The drum 26 comprises a cylindrical member 29`secured about the shaft 27, and a plurality of grinding teeth or studs 30 are threaded into the cylinder 29 in parallel rows. These studs 30 are of tapering construction and by providing these studs with threads on the inner ends thereof, they may be readily removed for replacement when they have become unduly worn. A pulley 31 is secured to one end of the shaft 27, and is adapted to have a belt or ilexible member 32 trained thereover, the belt also being trained over a suitable power member (not shown) so that the drum 26 may be rotated at the desired speed.

A plate 33 is secured as by bolts 34, to the inside face of the rear wall 13, and a plurality of upper grinding members 35 are secured in a horizontal plane to the plate 33 in a position above the horizontal transverse axis of the drum 26, and a second series of fixed studs or teeth 3S are secured to the plate 33 in a position substantially in alinement with the horizontal transverse axis of the drum 26.

These upper teeth 35 constitute roughing teeth, that is, these teeth are spaced apart a suicient distance so that the rotating teeth 30 can pass therebetween, but due to the fact that they are positioned above the horizontal center of the drum 26, the teeth 30 will not mesh as closely with the teeth 35 as the teeth 30 will mesh with the lower teeth 36. These lower 'teeth 36 constitute the fine pulverizing teeth or finishing teeth, and when the material has passed these teeth 36, it has been ground or pulverized to substantially the desired degree.

A screen or perforate ymember 37 of arcuate construction in cross section is secured as by bolts 38 along one edge thereof to the lower end of the front wall 12 and as by bolts 33 to the lower edge of the rear wall 13. This screen or periorate member 37 is disposed closely adjacent the ends of the rotating teeth 30, and is adapted to prevent any large particles from dropping downwardly into a chute, generally designated as 40, which is supported below the hopper 10. The chute 40 is mounted'on a rearward and downward inclination, and is provided with a pivoted closure 41 operated by a lever 42, so that the material in the chute or lower hopper 40 can be released when desired, as where the material is being sacked or placed in other containers. i

A hood 43 is secured to the top 4of the hopper y1G and extends forwardly and upwardly from the rear wall 13, and is provided with depending sides 44 engaging the sides 11 below the upper edge thereof. This hood 43provides a means for preventing spilling of the unpulverized material when it is placed in the hopper or ycasing 10.

A'baflie 45 having side iianges 46 is disposed within the hopper or casing 10, and is provided with opposed elongated slots 47 through which bolts 48` are positioned to adjustably position the bale 45 within the casing or hopper 10. The lower edge of this baffle 45 is provided with a forwardly' extending angularly related flange 49, which prevents any material carried karound bythe drum 26 from being thrown upwardly against the material flowing downwardly into the hopper 10.

This barile 45 constitutes a means whereby the grinding rate of the drum 26 may be varied to suit the needs or desires of the operator. The

i lower end of this Abaille 45 is directed toward the fixed upper teeth 35 so that the material sliding or flowing downwardly over the baiiie 45 will be dischargedin a position for grinding between the upper teeth 35 and the rotatable teeth 30.

In the use and operation of this device, the drum or rotatable member 26 may be operated at the desired speed, and the desired material placed into the casing or hopper 10 with the baffle 45 positioned with the lower end thereof adjusted relative to the rear wall 13 to permit the ow ofthe material downwardly at the desired rate. The material striking the teeth 30 and the teeth 35 will be roughly ground therebetween and will then pass downwardly'for engagement with the lower or nishing teeth 36. After the material has ypassed between the iinishing teeth 36 and the teeth 30 of the drum, it will fall downwardly onto the screen 37. This screen 37 is of the detachable type so that any desired degree of mesh or perforations can be provided so that the material discharging into the chute or lower hopper 40 will be of the desired degree It will, of course, be understood that the rear wall 13 can be adjusted relative to the drum 26 so that the degree of pulverization can be varied also by adjusting this rear wall, which will in turn adjust the fixed teeth 35 and 36 relative to the revolving teeth 30.

It is, of course, understood that various changes and modications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

What is claimed is:-.

i l. A pulverising nieanscomprising a casing and means in the casing to pulverize material` passing therethrough, said casing comprising a pair of side walls spaced apart, a pair of end walis on opposite sides of said pulverizing means, a plurality of angle members each having a leg thereof iixed to an end wall and the other leg confronting a side wall and provided with an elongated slot, bolts carried by the side walls passing through the slots for securing the end walls in adjusted position relative to each other and to said pulverizing means, grinding teeth carried by the inner face of one of the end walls, and a screen secured to the lower end of each end wall and adjustable toward or away from said pulverizing means coactive with the adjustment of the end walls relative to each other.

2. A- pulverizing means comprising a casing and means in the casing to pulverize material passing therethrough, said casing comprising a pair of side walls spaced apart, a pair oi end walls on opposite sides of said pulverizing means,

iss l lll@ a plurality of angle members each having one lower end thereof, bolts passing through the slots K in the side portions of the plate and the side walls to secure the plate in adjusted position coactive with the adjustment of said one end wall, a pluraltiy of teeth secured to the other end wall, a screen member, means for securing the screen member to the lower ends of each end wall, said screen member being adjustable toward or away from the pulverising means coactive with the adjustment of the end walls, a hopper beneath the screen, and a valve member carried by the hopper. y

PAUL W. KENNEDY. 

